Subject: Does it matter where you put the weights on a Pinewood Derby race car?

It's time for our annual Cub Scout Pinewood Derby race.  The cars are cut 
out of a block of wood (you then add nails for axles and wheels) and you 
can add weights to bring the total weight up to no more than 5oz.  The 
race track starts with a steep incline followed by a straightaway. Gravity 
does all the work. The fastest car gets the trophy!
   Will a 5oz car necessarily do better than a lighter car?  Should I put 
the weights toward the front, back or evenly distributed and why would the 
position matter?  What's the physics involved?  Thanks.

Re: Does it matter where you put the weights on a Pinewood Derby race car?